Denis Johnson’s Tree of Smoke, 1963 from the point of view of an American G.I. in the Philippines. The next book self reads after this is Mark Twain’s Following the Equator. Which will probably be oh such a blessed relief:

He’d passed all the previous night with the prostitute the colonel had paid for. The girl had slept on the floor and he in the bed. He hadn’t wanted her. He wasn’t sure about these Filipino people.